Remove SK_ENABLE_SKSL_IN_RASTER_PIPELINE from Bazel.

This flag was removed at http://review.skia.org/736880.

Change-Id: I7a34426b096e43db5592e46fe31eef4b7c6f0d3c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/743238
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
2 files changed